Find the average in a window of random variables

2 views (last 30 days)
Hi pls
I have 10 random variables ( 2,4,5,6,3,4,5,7,8,6)
I want to write a matlab code that will do this computation using 5 window length ( k = 5)
1st window length (2,4,5,6,3)
2nd window length ( 4,5,7,8,6)
then I can find the average of each windom numbers
1st window average = 4
2nd window average = 6
Thanks in advance
Thanks in advance

Accepted Answer

Adam Danz
Adam Danz on 28 May 2020
Edited: Adam Danz on 22 Aug 2020
Matlab has movmean() but it I don't think it can move by groups of n elements.
This demo below computes a moving average for values [1:n, 1*n+1:2*n, 2*n+1:3*n, 3*n+1:4*n, etc...]
If the number of data points is not dividible by n, the data are padded with NaN values and the last average will only consider non-nan values.
data = 1:22; % Demo data
winSz = 5; % Window size
% Reshape data into matrix.
% NOTE: 'data' must contain a number of element divisibly by 'winSz'.
% Otherwise, 'data' will be padded with NaN values so that it is
% divisible by 'winSz'.
if rem(numel(data),winSz)>0
nanAppend = nan(winSz - rem(numel(data),winSz),1);
else
nanAppend = [];
end
dataMat = reshape([data(:); nanAppend], winSz, []);
movingAverage = mean(dataMat,1,'Omitnan');
% Result
% movingAverage =[3 8 13 18 21.5]
To compute the means of groups that share endpoints (e.g. indices 1:5, 5:9, 9:13, ...), see this answer.

More Answers (0)

Categories

Find more on Creating and Concatenating Matrices in Help Center and File Exchange

Products


Release

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!